82 lines
3.1 KiB
Java
82 lines
3.1 KiB
Java
package io.github.applecommander.bastools.api.directives;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.nio.file.Files;
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import java.util.Optional;
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import io.github.applecommander.bastools.api.Configuration;
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import io.github.applecommander.bastools.api.Directive;
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import io.github.applecommander.bastools.api.model.ApplesoftKeyword;
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import io.github.applecommander.bastools.api.model.Line;
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public class EmbeddedBinaryDirective extends Directive {
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public EmbeddedBinaryDirective(Configuration config, OutputStream outputStream) {
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super(config, outputStream);
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}
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@Override
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public void writeBytes(int startAddress, Line line) throws IOException {
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if (parameters.size() != 2) {
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throw new IllegalArgumentException("$embed requires a name and address parameter");
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}
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String filename = requiresString();
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int targetAddress = requiresInteger();
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File file = new File(config.sourceFile.getParentFile(), filename);
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byte[] bin = Files.readAllBytes(file.toPath());
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Optional<Line> nextLine = line.nextLine();
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byte[] basicCode = nextLine.isPresent()
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? callAndGoto(startAddress,nextLine.get())
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: callAndReturn(startAddress);
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final int moveLength = 8*3 + 2 + 3; // LDA/STA, LDY, JMP.
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int embeddedStart = startAddress + basicCode.length + moveLength;
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int embeddedEnd = embeddedStart + bin.length;
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outputStream.write(basicCode);
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setAddress(embeddedStart, 0x3c);
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setAddress(embeddedEnd, 0x3e);
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setAddress(targetAddress, 0x42);
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ldy(0x00);
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jmp(0xfe2c);
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outputStream.write(bin);
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}
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// In program, "CALL <address>:GOTO line"
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private byte[] callAndGoto(int startAddress, Line line) throws IOException {
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// 3 for the tokens "CALL", ":", "GOTO", end of line (0x00)
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final int tokenCount = 3 + 1;
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int offset = Integer.toString(line.lineNumber).length() + tokenCount;
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offset += Integer.toString(startAddress).length();
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// Attempting to adjust if we bump from 4 digit address to a 5 digit address
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if (startAddress < 10000 && startAddress + offset >= 10000) offset += 1;
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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os.write(ApplesoftKeyword.CALL.code);
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os.write(Integer.toString(startAddress+offset).getBytes());
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os.write(':');
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os.write(ApplesoftKeyword.GOTO.code);
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os.write(Integer.toString(line.lineNumber).getBytes());
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os.write(0x00);
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return os.toByteArray();
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}
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// At end of program, just "CALL <address>:RETURN"
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private byte[] callAndReturn(int startAddress) throws IOException {
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// 3 for the tokens "CALL", ":", "RETURN", end of line (0x00)
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final int tokenCount = 3 + 1;
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int offset = tokenCount;
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offset += Integer.toString(startAddress).length();
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// Attempting to adjust if we bump from 4 digit address to a 5 digit address
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if (startAddress < 10000 && startAddress + offset >= 10000) offset += 1;
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ByteArrayOutputStream os = new ByteArrayOutputStream();
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os.write(ApplesoftKeyword.CALL.code);
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os.write(Integer.toString(startAddress+offset).getBytes());
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os.write(':');
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os.write(ApplesoftKeyword.RETURN.code);
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os.write(0x00);
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return os.toByteArray();
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}
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}
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